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a)15/8:9/8/7/8;3/8
b)3/5;7/15;4/15;8/45
c)9/4;47/10;4/5;3/8
a) \(\frac{3}{8},\frac{15}{8},\frac{9}{8},\frac{7}{8}\)
Từ lớn -> bé:
=>\(\frac{15}{8},\frac{9}{8},\frac{7}{8},\frac{3}{8}\)
b) \(\frac{4}{15},\frac{3}{5},\frac{8}{45},\frac{7}{15}=\frac{12}{45},\frac{27}{45},\frac{8}{45},\frac{21}{45}\)
Từ lớn -> bé:
=> \(\frac{3}{5},\frac{7}{15},\frac{4}{15},\frac{8}{45}\)
c) \(\frac{3}{8},\frac{4}{5},\frac{47}{40},\frac{9}{4}=\frac{15}{40},\frac{32}{40},\frac{47}{40},\frac{90}{40}\)
Từ lớn -> bé:
=>\(\frac{9}{4},\frac{47}{40},\frac{4}{5},\frac{3}{8}\)
\(\frac{4}{15};\frac{3}{5};\frac{8}{45};\frac{7}{15}\)
Sắp xếp: \(\frac{3}{5};\frac{7}{15};\frac{4}{15};\frac{8}{45}\)
\(\frac{3}{8};\frac{4}{5};\frac{47}{40};\frac{9}{4}\)
Sáp xếp: \(\frac{9}{4};\frac{47}{40};\frac{4}{5};\frac{3}{8}\)
Câu 1
5 ha 15 m2 = 50015 m2 ( B đúng )
Câu 2
- Theo thứ tự từ bé đến lớn: 9/40; 1/4; 3/10; 3/8
- HT -
=> \(\frac{1}{3}< \frac{4}{5}< \frac{41}{45}< \frac{11}{9}< \frac{11}{5}\)
\(\frac{1}{3};\frac{4}{5};\frac{41}{45};\frac{11}{9};\frac{11}{5}\)
HOK TỐT
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
\(1\frac{1}{2};1\frac{1}{3};1\frac{1}{4};1\frac{1}{5};1\frac{1}{6};1\frac{1}{7};1\frac{1}{8}\)\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
Vì \(\frac{1}{2}>\frac{1}{3}>\frac{1}{4}>\frac{1}{5}>\frac{1}{6}>\frac{1}{7}>\frac{1}{8}\)
=> \(1\frac{1}{2}>1\frac{1}{3}>1\frac{1}{4}>1\frac{1}{5}>1\frac{1}{6}>1\frac{1}{7}>1\frac{1}{8}\)
Hay \(\frac{3}{2}>\frac{4}{3}>\frac{5}{4}>\frac{6}{5}>\frac{7}{6}>\frac{8}{7}>\frac{9}{8}\)
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)\(\frac{3}{2};\frac{4}{3};\frac{5}{4};\frac{6}{5};\frac{7}{6};\frac{8}{7};\frac{9}{8}\)
a) 10 x 18/27 x 15
= 2 x 5 x 2 x 9/3 x 9 x 3 x 5
= 4/9.
b) 1 x 2 x 3 x 4 x 5 x 6/7 x 8 x 9
= 1 x 2 x 3 x 4 x 5 x 3 x 2/7 x 2 x 4 x 3 x 3
= 1 x 5 x 2/ 7
= 10/7
c)\(1\frac{1}{2}.1\frac{1}{3}.1\frac{1}{4}.1\frac{1}{5}\)
\(=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.\frac{6}{5}\)
\(=3\)
d) \(1\frac{1}{2}:1\frac{1}{3}:1\frac{1}{4}:1\frac{1}{5}=\frac{3}{2}:\frac{4}{3}:\frac{5}{4}:\frac{6}{5}=\frac{3}{2}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}=\frac{3}{4}\)
2. a) 0,123; 0,132; 0,213; 0,231; 0,312; 0,321.
b) 0,321; 0,312; 0,231; 0,213; 0,132; 0,123
3. 5 số đó là; 0,11;0,12;0,13;0,14;0,15
a) 0,11;0,12;0,13;0,14;0,15
b) 0,15;0,14;0,13;0,12;0,11
Bài 4
35/85 = 7/17
36/108 = 1/3
25/100 = 1/4
39/52 = 3/4
Bài 8
a) 9/8 và 7/12
= 8×3=24 ; 12×2=24
=>9/8 =27/24
=> 7/12 ; 14/24
b) 3/20 và 4/15
=20×3=60 ; 15×4=60
=> 9/60 ; 16/60
Bài 9
a) \(\frac{3}{8},\frac{15}{8},\frac{9}{8},\frac{7}{8}\)
Từ lớn -> bé:
=>\(\frac{15}{8},\frac{9}{8},\frac{7}{8},\frac{3}{8}\)
b) \(\frac{4}{15},\frac{3}{5},\frac{8}{45},\frac{7}{15}=\frac{12}{45},\frac{27}{45},\frac{8}{45},\frac{21}{45}\)
Từ lớn -> bé:
=> \(\frac{3}{5},\frac{7}{15},\frac{4}{15},\frac{8}{45}\)
c) \(\frac{3}{8},\frac{4}{5},\frac{47}{40},\frac{9}{4}=\frac{15}{40},\frac{32}{40},\frac{47}{40},\frac{90}{40}\)
Từ lớn -> bé:
=>\(\frac{9}{4},\frac{47}{40},\frac{4}{5},\frac{3}{8}\)
Bài 10
a, Ta có
`x/15 < 4/15`
` <=> x < 4`
` <=> x ∈ {1 ; 2 ; 3}`
b, Ta có
`5/9 > x/9`
` <=> 5 > x`
` <=> x ∈ {1 ; 2 ; 3 ; 4}`
c, Ta có
`1 <x/8 < 11/8`
` <=> 8/8 < x/8 < 11/8`
` <=> 8 < x <11`
` <=> x ∈ {9 ; 10}`